Air intake system of an internal-combustion engine

Abstract

The air intake system of an internal-combustion engine has a branching between the throttle housing and a collecting tank from which suction pipes lead to the cylinder head of the internal-combustion engine. This branching divides the intake air which flows into it in a single flow and guides it to the collecting tank by way of several lines. This arrangement has a simple construction and causes a torque and power increase over a wide rotational-speed range.

What is claimed: 
     
       1. An air intake system of an internal-combustion engine having at least one bank of cylinders in which the intake air flows from an air filter to each bank of cylinders through a measuring device preferably constructed as an air mass sensor and through a throttle housing and from there is guided into a collecting tank which is connected to a cylinder head of the internal-combustion engine by means of suction pipes, wherein a branching is arranged between the throttle housing and the collecting tank, from which branching a plurality of pipe sockets are connected to the collecting tank in such a manner that the intake air flows into the collecting tank from different directions, the plurality of pipe sockets including a first pipe socket connected to a first inlet opening of the collecting tank by a direct intake line and a second pipe socket connected to a second inlet opening of the collecting tank by a bypass line, the center of the second inlet opening being disposed on an extension of the longitudinal center axis of the first pipe socket and on a side of the collecting tank which is opposite the first inlet opening. 
     
     
       2. An air intake system according to claim 1, wherein the branching comprises a direct pipe socket leading to the collecting tank. 
     
     
       3. An air intake system according to claim 2, wherein the plurality of open sockets include angular pipe sockets connected to the branching as a part of bypass lines. 
     
     
       4. An air intake system according to claim 3, wherein the bypass lines are constructed in one piece with the collecting tank. 
     
     
       5. An air intake system according to claim 3, wherein the bypass lines are constructed as a separate connection between the pipe sockets and the collecting tank. 
     
     
       6. An air intake system according to claim 3, wherein intake air flowing into the collecting tank flows in perpendicularly with respect to the walls surrounding the collecting tank. 
     
     
       7. An air intake system according to claim 4, wherein intake air flowing into the collecting tank flows in perpendicularly with respect to the walls surrounding the collecting tank. 
     
     
       8. An air intake system according to claim 5, wherein intake air flowing into the collecting tank flows in perpendicularly with respect to the walls surrounding the collecting tank. 
     
     
       9. An air intake system according to claim 3, wherein the longitudinal center axes of the pipe sockets enclose an acute angle with the longitudinal center axis of the direct pipe socket. 
     
     
       10. An air intake system according to claim 4, wherein the longitudinal center axes of the pipe sockets enclose an acute angle with the longitudinal center axis of the direct pipe socket. 
     
     
       11. An air intake system according to claim 6, wherein inlet openings are arranged in the walls surrounding the collecting tank. 
     
     
       12. An air intake system according to claim 11, wherein the longitudinal center axes of the pipe sockets are disposed in a plane, and wherein the centers of the inlet openings are disposed in said plane. 
     
     
       13. An air intake system according to claim 12, wherein a four-cylinder in-line internal-combustion engine having a collecting tank which has an almost cuboid shape is provided. 
     
     
       14. An air intake system according to claim 12, wherein a four-cylinder in-line internal-combustion engine having a collecting tank which has an almost cuboid shape is provided, wherein the center of the inlet opening assigned to a first bypass line is disposed on the extension of the longitudinal center axis and on a side of the collecting tank which is opposite the inlet opening, and wherein the direction of the intake air flowing in through the inlet opening assigned to a second bypass line extends transversely with respect to the longitudinal center axis. 
     
     
       15. An air intake system according to claim 13, wherein the length of the bypass line amounts to between 550 mm and 750 mm. 
     
     
       16. An air intake system according to claim 14, wherein the length of the bypass line amounts to between 550 mm and 750 mm. 
     
     
       17. An air intake system according to claim 15, wherein the first bypass line has a longer length than the second bypass line. 
     
     
       18. An air intake system according to claim 16, wherein the first bypass line has a longer length than the second bypass line.